Bible & Christianity › The medieval church
The Crusades
1095–1291· Event· Bible story & events
Historical recordConfirmed by archaeology, outside sources or contemporary records.
A series of papally backed military expeditions, 1095–1291, mainly to win and hold Jerusalem and the Holy Land from Muslim rulers.
See it on the Bible & Christianity map →What it is
In 1095 Pope Urban II called Western knights to help the Byzantines and free Jerusalem, promising forgiveness of sins. The First Crusade took the city in 1099 and founded four 'crusader states'. Saladin retook Jerusalem in 1187; later crusades failed to hold it, and the Fourth Crusade sacked Christian Constantinople in 1204 instead. Acre, the last major crusader city, fell in 1291. Crusades were also fought in Spain, the Baltic, and against heretics in southern France.
Why it matters
They hardened Christian–Muslim and Catholic–Orthodox hostility, expanded papal power, boosted Mediterranean trade, and remain a charged memory in both the Middle East and the West.
Sources and history
Rich sources on all sides: papal letters, crusader chronicles, Byzantine writers such as Anna Komnene, and Arab historians such as Ibn al-Athir. Castles like Krak des Chevaliers in Syria still stand.
Questions and debates
Historians debate motives (faith, land, adventure, escape from debt) and whether the crusades were aggression or a response to earlier Islamic conquests; that framing still divides opinion.
Inside this (2)
Connections (5)
▸The Crusades fought for control of Jerusalem, City of DavidHistorical record
The connection
Jerusalem, holy to Jews, Christians and Muslims, had been under Muslim rule since 637/638. Winning it back was the crusades' central aim: crusaders held it from 1099 to 1187, regained it briefly by treaty from 1229, and lost it for good in 1244.
When and where
Jerusalem: taken July 15, 1099; retaken by Saladin October 2, 1187; regained by Emperor Frederick II's treaty in 1229; sacked by Khwarazmian troops in 1244.
Historical evidence
Well documented in Latin, Greek, Arabic and Hebrew chronicles, letters and treaties, and in crusader rebuilding at the Church of the Holy Sepulchre.
Questions and debates
How central Jerusalem stayed is debated, since later crusades often targeted Egypt, Constantinople, the Baltic or Europe's own heretics.
▸Rise of Islam and the Arab conquests set the stage, centuries later, for The CrusadesMostly agreed by scholars
The connection
The Arab conquests of the 630s–640s took Jerusalem, Syria and Egypt from Christian rule, and North Africa followed by about 700. Centuries later, Seljuk Turkish victories over Byzantium, above all at Manzikert in 1071, prompted the Byzantine emperor's appeal that Pope Urban II turned into the First Crusade.
When and where
Jerusalem fell to Caliph Umar in 637/638; Manzikert, eastern Anatolia, 1071; Urban II's call at Clermont, France, November 1095.
How do we know?
The sequence is well documented. Chroniclers' versions of Urban's speech cite Turkish attacks on Eastern Christians and on pilgrims.
Questions and debates
Whether the crusades were a defensive response to Islamic expansion or Western aggression is a live debate; Eastern Christians had by then lived under Muslim rule for over 450 years.
▸The papacy: the popes and medieval Christendom launched The CrusadesHistorical record
The connection
Pope Urban II preached the First Crusade at Clermont in 1095, offering forgiveness of sins to those who went. Popes kept calling crusades, granting indulgences, taxing clergy to pay for them, and aiming them at Muslims, pagans and heretics. Crusading showed that the papacy could mobilize Europe's armies.
When and where
Council of Clermont, France, November 27, 1095; later crusades called by Eugenius III (1145), Gregory VIII (1187) and Innocent III (1198, 1208).
Historical evidence
Papal bulls such as Quantum praedecessores (1145) survive, and several chroniclers recorded Urban's sermon.
Questions and debates
What Urban actually said at Clermont is uncertain: the five main accounts were written years later and differ in emphasis.
▸The Crusades began with First Crusade takes JerusalemHistorical record
The connection
The First Crusade was the first and most successful crusade. Its capture of Jerusalem in 1099 seemed to prove the idea worked, and the crusader states it founded needed defending, prompting the Second Crusade after Edessa fell in 1144.
When and where
Called at Clermont in 1095; armies set out in 1096 and reached Jerusalem in 1099.
Historical evidence
Numbering the crusades is modern, but medieval writers already saw 1095–1099 as the start of a movement.
Questions and debates
Historians debate whether it succeeded through faith and determination or luck: Muslim rulers in Syria were divided, and the Fatimids and Seljuks were rivals.
▸The Crusades sacked, in 1204, Constantinople, the 'New Rome'Historical record
The connection
The Fourth Crusade, bound for Egypt, owed Venice for its ships and was diverted to Constantinople by a Byzantine prince's promise of money. In April 1204 crusaders sacked the city, looted churches including Hagia Sophia, and set up a Latin empire that lasted until 1261.
When and where
Constantinople, April 12–15, 1204; led by Boniface of Montferrat and Venice's Doge Enrico Dandolo.
Historical evidence
Eyewitness accounts by Geoffrey of Villehardouin, Robert of Clari and the Byzantine Niketas Choniates survive; the bronze horses of St. Mark's in Venice were taken then.
Questions and debates
Whether Venice planned the diversion or it was a chain of accidents is debated. Pope Innocent III condemned the sack; John Paul II apologized to the Orthodox in 2001.